Surface quality and deformation issues

[Limehound]

Hello.

Got my Mars few day ago. Test print (rooks) was good, so I decided to print something more challenging. I've printed that STL using 3D hubs year ago or so, and print quality was quite good. My Mars, however, deformed the shape and surfaces.

Print is basically a hallowed cube with some minor details.

Here are pictures:
1. Some surfaces are good, but still slightly deformed.
2. One edge of the cube is badly deformed and have some holes
3. Another surface has a lot of holes and deformations

Orientation and support were set in Prusa Slicer, before slicing in CHITUBOX:

4. STL with supports
5. Defects on the model

After the first attempt, I've tried two other things:

6. Added more support for the same STL.

Didn't help... One corner of the cube still "melted", also there are defects in other areas.

I also tried to print same shape without hallowing. This one also didn't work well.

7. One corner of the cube appears to be melted...
8. ...while another is pulled out.

I'm using basic black Elegoo resin with 7 second exposure time per level (other parameters are default).

I would appreciate help making it right.
If an issue is with support and somebody can explain how to do it properly, I can provide STL.

Thanks!

[cliffyk]

In my experience 7 seconds is not sufficient for black resin.

Here are the Chitubox settings I use for most all black resins (sometimes it helps to bump the bottom layer count to 8-10):

[Limehound]

I've printed it again with white resin (8 sec per layer) and noticed significant degradation in level of details.
And one edge of the cube still pulled out!

https://imgur.com/5enAIjw - worse details than with black resin
https://imgur.com/paXKbTn - wrapping (?)

[silverglade303]

I am having a similar issue, the areas closest to the build plate are coming out looking melted while the rest of the print looks great. 

https://imgur.com/a/yycTD5c
https://imgur.com/a/pftJbUG

[Chris-Draw]

I have a NEW Mars 2 Pro, I am having the same issues as all above, 'Melting' on under surface of part. I have tried making the support higher off the rack IE 3mm and Tipping the model up by 10 degrees to lessen the area being cured at one pass. Still 'melting' near the plate surface end.
Have to say I'm disappointed at the moment, trying all differnet settings, from those recommended on the Resin Bottle, to default, and then changes in between.

Has anyone had a real answer to this problem or is it the quality of the Mars machines? ATB Chris